Loosness and being off face are two separate things. The gun may be tight but still be off face. It could be evenly off face or a bigger gap could be at the top of the breech than the bottom. It is not abnormal to be able to see light between the breech and breech face on a side or area of the breech.
Many use the general rule of thumb that if you can close a piece of paper in the breech and not be able to pull the paper out, then it is fine.
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B. Dudley
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